Test-indicator.



No. 825,911. PATBNTBD JULY 17, 1906.

. H. KOCH.

TEST INDICATOR.

APPLICATION FILED MAY 4, 1906.

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UNITED STATES vPArinvii` OFFICE.

HENRY KOCH, or NYACK, ,Newv YORK. Y

TEST-INDICATOR.

Specification 4ofvLetters Patent.

Patented July 17, ieoa.

'Applicatiouled Ma'y4,1906. Serial No. 315,184,

To all -wh'om/ it may concern:

ack, in the county of Rockland. and State of New York, have made andinvented certain .new and useful Improvements in Test-Indicat-ors, ofwhich. the following is a sp'eciiica--l My invention relates to animprovement in test-indicatorsthat is, an indicator use'd to test anddetermine the imperfections of inside, outside, or surface work, andalso employed for testing lathe-centers or. work'held etween centers andfor setting centrally a hole or point in a piece of work under opera'-tion in a lathe or upon a face-.plate-the object being to provide adevice of this character which shallbe simple and economical inconstruction, accurate in its operation, 'and so constructed andarranged as to avoidany liability of getting out of order.

With these and other ends in view the invention consists in certainnovel features of construction and combinations of parts, as

will be hereinafter fully described, and point-p ed out in the claims.

, In the accompanying-drawings', Figure 1 is a perspective view ofatest-indicatorcom. structed m accordance with my mventionl Fig. 2isa'plan-view of the same with the cover removed. A Fig. 3' is a similar Vview showing the parts in an indicatin position. Fig. 4 is a sectionalview taken on t e line 4 4 of Fig. 3. Fi 5 is a sectional view'taken onthe line 5 5 o Fig. 3. Fig. 6 is a sectional view taken on the line 6 6of F-ig. 2.

`By reference to the drawings it will be seen 'that the operative partsof the in dicator are contained within a metal box or receptacle A,having',I a removable cover vB extending nearly the length of the box,but leaving a lateral opening C between the end ofsaid f cover B and the`graduated ga e-plateD,'

screwed or otherwisesecured to t e forward end of the box A, and throughwhich opening may be seen the end of the indicating-lever E;

' The forward end of the box A is provided with the tube or barrel'V F,through which extends the rod G, the opposite end of the latter restingin the sleeve H, setin the rear end of the box A. The forward end of therod G is 'provided with the rounded end o r knob I,

adapted to come into contact withthe surface of the article under test,and also with the disk J, adapted to limit the movement of thethetendency of the spring being to force said rod G outwardly, asillustrated in Fig. 2, so that the end of the indicating needleforleverE will normallyrest at zero on the graduated plate D. 'v

To the forward end of the box is pivoted'at Z, the bell-crank lever L,the short ann Vm of which is bifurcated, as illustrated ,fin Figs. 44'and 6, and straddles the rod G, somewhat re- 8o duced in diameter, asshown at. fn, formin4 two shoulders n. and n?, whereby when sai rod Gisforced toward .the forwardend -by the .spring K said shoulder n,Striking the short' armm, will swingthe longer arm L to its normalositionthat is, toward one side' of the box asindicated in Fig. 2 -thebifurcation of the arm m at the same time allowing the rod'G to befreely pushed backwardly by' pressure onthe forward'end I without posi#tive engagement of said rod withsaid arm m.

To the rear end of the boxV or rece tacle A is pivoted at o the bentlever or-inf 'eating- Vneedle E, from the under side .of which roi jectsdownwardly the pine, against w 'ch` latter bears the free end of thelever Land on the opposite side of which pin e bears thefree end -of thespring M,.the o p ositejeud of said spring being secured in the orwardend of the receptacle A, the tendenc of said s ring M being to forcethe-free en of the indicating lever or 'needle E toward the fulcrum ofthe bell-crank lever L. As the tendency, however, of the springK'is1somewhat greater than that of the sprin M', the lever or needle Eis held in its norma position', as indicated inFig..2.

When reseure is applied tothe endl of thevrod GP bysome imperfection inthe arti,- cle under test, the rod G is forced backward] overcoming thetension of the spring whereupon .the tension of th spring M, bearing onthe pin e, will imme iately .move the free end of the indicating needleor lever E toward the OPPOSie'end of the graduated "1:55p2

plate D. When, however, the ressure'om 'the end I of the rod G isrelieve ,the spring' K\will force'the rod G forwardly, whereby theshoulder n2, striking the shorter arm 'm of r the bell-crank lever, willmove said arm forx'zo roo ing against the pin e on the lever E, will-move said indicating needle back to its normal position, as indicatedin Fig. 2. In other words,

when the rod Gr is moved backwardly by pres'- sure on the end I, theindicating-needle E will be moved toward the opposite end of thegraduated plate D, as illustrated in Fig. 3, and when t e pressure isrelieved on said rod the spring K, overcoming the tension of the springM, will-move the indicating-needle Sgo armP` will force backwardly therod Gr,A over? Each into itsvnormal position, as indicated in From theforegoing it will be understood that instead of one lever actingdirectly upon the indicating-needle to vmove the same, as-is vusuallythe case in indicators 'as now commonly constructed, I simply overcomeby 'pressure the tension of one, spring, wherebyto allow theflatterspring to move or operate the indicating-needle, and thereby avoid anyand 'all danger of disrupting, breaking, or disarranging the arts when asudden Jar or blow is given to t erod or lever employed tolengage andmove the indicatingleven As it is sometimes required. to employ theindicator in a narrow constricted space or opening between the parts ofan article under test, I secure in the back of the case A the 'sleeve H,provided with the slotted rod N, in which is fulcrumed at r a bell-cranklever, the- `longer arm `O of which rests in and projects out be ond theslotted rod N, as' clearly indi'cat in Figs-1, 2, and 3, the end.of theshort arm P of which lever fits in a groove or `recess s in the rear endof the rod G. By reason of this construction and arrangement of. arts itbe'understood that when the en ofthe arm O is forced inwardly the -shortlcoming the tension of the springK and oper- ,ating in every Wayv thesame as though; vresfy sure ,were applied to the forward end o the rod?I and resulting 'inmoving lthe indicating 'lever or needle E, asillustrated in Fig.v 3. In suchl instances, therefore, where thecontracted space'between the .parts Will not per- Imit of applying theforward end I oi th-e rod to the work the post or rod N may beinserted',bringing the end of the arm O into contact with the Work.v and bymovement of which arm' O the'imperfections in said work will beindicated by the lever E. v The under side of the box A may have formedthereon or secured' thereto the threaded post S, whereby to secure the.indicator to a handle or other device (not shown) of any desired shape.or pattern.

Having fully described my invention, what vlI claim as new, and desireto secureby Letters Patent, is-

1. An indicator ofthe character described, i

comprising a casing, a spring-actuated-rod extending through the same,an indicatingl needle, a lever engaging with needle at one end and saidrod at the other end, and a spring engaging said needle for moving thesame, substantially as described.

comprising a casing, a rod extendingthrough the same, a spring forholding said rod in its normal position, an indicating-*needle pivotedto said casing, a spring secured to said casing and engaging said needlefor moving the latter in one direction, and a lever ivoted to saidcasing and engaging said need e and. said rod* for moving said indicatin-needle in the opposite direction, substantialiy as described.

3. An: indicator of the character described, comprising a casing, a rodextending longitudinally through the same, a springfor hold ing said rodin its normal position, an indicating-needle pivoted at one end ofs'aidcasing, the opposite end being free, a spring securedat one end, and atits opposite end* engaging said needle for movin the latter in onedirection, and a bell-cranlever', one arm of which engages said needle,and the other arm of which engages said rod for moving said needle in.vtheopposite direction, substantially as described".

4. An indicator of the character described, comprising a casing, a rodextending longitudinally through said casing, a spring for holding saidrod in its normal position, an indicating-needlepivoted at one end tosaid'casing, its opposite end: being free, and provided with a pin, aspring secured to said casing and: engaging the pin on said needle formoving the latter' in one direction, a bell-crank lever pivoted to saidcasin one arm of which engages said pin on. sai needlefand the other armof which straddles and engages said rod, whereby to move the needleinthe opposite direction, substantially as described.

5. A test-indicator of the character described. coml rising a casing, arod extending.

y through the same, a spring for" lo itudinal holling said rod in itsnormal position, an in dicating-needle pivoted at one end. to saidcasing, its opposite end being free, and. provided with av pin, aspringsecuredat one end to. said. casing', Ithe vopposite free end engaging 2.An indicator of the character described,

IOO

said pin, a bell-crank lever pivoted to said casing, one arm of whichengagesl said rod., the other arm-engaging said pin, and. a bell.- cranklever pivoted in said casing, one arm of which extends outwardlytherefrom, and the other arm of which engages the rear end of said'rod,substantially as described. i

Signed at Nyack, in thel county of Rocklandr and State of 'New York,this 2d d-ay of May, A. D. 1906. l v

HENRY KOCH.

,Witnesses Vieron ACKERMAN, e' DAVID, W. CENTRY.

